1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 236cf515bSGary R Hook /* 336cf515bSGary R Hook * AMD Cryptographic Coprocessor (CCP) AES GCM crypto API support 436cf515bSGary R Hook * 568cc652fSGary R Hook * Copyright (C) 2016,2017 Advanced Micro Devices, Inc. 636cf515bSGary R Hook * 736cf515bSGary R Hook * Author: Gary R Hook <gary.hook@amd.com> 836cf515bSGary R Hook */ 936cf515bSGary R Hook 1036cf515bSGary R Hook #include <linux/module.h> 1136cf515bSGary R Hook #include <linux/sched.h> 1236cf515bSGary R Hook #include <linux/delay.h> 1336cf515bSGary R Hook #include <linux/scatterlist.h> 1436cf515bSGary R Hook #include <linux/crypto.h> 1536cf515bSGary R Hook #include <crypto/internal/aead.h> 1636cf515bSGary R Hook #include <crypto/algapi.h> 1736cf515bSGary R Hook #include <crypto/aes.h> 1836cf515bSGary R Hook #include <crypto/ctr.h> 19cf0bd0aeSCorentin LABBE #include <crypto/gcm.h> 2036cf515bSGary R Hook #include <crypto/scatterwalk.h> 2136cf515bSGary R Hook 2236cf515bSGary R Hook #include "ccp-crypto.h" 2336cf515bSGary R Hook 2436cf515bSGary R Hook static int ccp_aes_gcm_complete(struct crypto_async_request *async_req, int ret) 2536cf515bSGary R Hook { 2636cf515bSGary R Hook return ret; 2736cf515bSGary R Hook } 2836cf515bSGary R Hook 2936cf515bSGary R Hook static int ccp_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key, 3036cf515bSGary R Hook unsigned int key_len) 3136cf515bSGary R Hook { 3236cf515bSGary R Hook struct ccp_ctx *ctx = crypto_aead_ctx(tfm); 3336cf515bSGary R Hook 3436cf515bSGary R Hook switch (key_len) { 3536cf515bSGary R Hook case AES_KEYSIZE_128: 3636cf515bSGary R Hook ctx->u.aes.type = CCP_AES_TYPE_128; 3736cf515bSGary R Hook break; 3836cf515bSGary R Hook case AES_KEYSIZE_192: 3936cf515bSGary R Hook ctx->u.aes.type = CCP_AES_TYPE_192; 4036cf515bSGary R Hook break; 4136cf515bSGary R Hook case AES_KEYSIZE_256: 4236cf515bSGary R Hook ctx->u.aes.type = CCP_AES_TYPE_256; 4336cf515bSGary R Hook break; 4436cf515bSGary R Hook default: 4536cf515bSGary R Hook crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); 4636cf515bSGary R Hook return -EINVAL; 4736cf515bSGary R Hook } 4836cf515bSGary R Hook 4936cf515bSGary R Hook ctx->u.aes.mode = CCP_AES_MODE_GCM; 5036cf515bSGary R Hook ctx->u.aes.key_len = key_len; 5136cf515bSGary R Hook 5236cf515bSGary R Hook memcpy(ctx->u.aes.key, key, key_len); 5336cf515bSGary R Hook sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len); 5436cf515bSGary R Hook 5536cf515bSGary R Hook return 0; 5636cf515bSGary R Hook } 5736cf515bSGary R Hook 5836cf515bSGary R Hook static int ccp_aes_gcm_setauthsize(struct crypto_aead *tfm, 5936cf515bSGary R Hook unsigned int authsize) 6036cf515bSGary R Hook { 6136cf515bSGary R Hook return 0; 6236cf515bSGary R Hook } 6336cf515bSGary R Hook 6436cf515bSGary R Hook static int ccp_aes_gcm_crypt(struct aead_request *req, bool encrypt) 6536cf515bSGary R Hook { 6636cf515bSGary R Hook struct crypto_aead *tfm = crypto_aead_reqtfm(req); 6736cf515bSGary R Hook struct ccp_ctx *ctx = crypto_aead_ctx(tfm); 6836cf515bSGary R Hook struct ccp_aes_req_ctx *rctx = aead_request_ctx(req); 6936cf515bSGary R Hook struct scatterlist *iv_sg = NULL; 7036cf515bSGary R Hook unsigned int iv_len = 0; 7136cf515bSGary R Hook int i; 7236cf515bSGary R Hook int ret = 0; 7336cf515bSGary R Hook 7436cf515bSGary R Hook if (!ctx->u.aes.key_len) 7536cf515bSGary R Hook return -EINVAL; 7636cf515bSGary R Hook 7736cf515bSGary R Hook if (ctx->u.aes.mode != CCP_AES_MODE_GCM) 7836cf515bSGary R Hook return -EINVAL; 7936cf515bSGary R Hook 8036cf515bSGary R Hook if (!req->iv) 8136cf515bSGary R Hook return -EINVAL; 8236cf515bSGary R Hook 8336cf515bSGary R Hook /* 8436cf515bSGary R Hook * 5 parts: 8536cf515bSGary R Hook * plaintext/ciphertext input 8636cf515bSGary R Hook * AAD 8736cf515bSGary R Hook * key 8836cf515bSGary R Hook * IV 8936cf515bSGary R Hook * Destination+tag buffer 9036cf515bSGary R Hook */ 9136cf515bSGary R Hook 9236cf515bSGary R Hook /* Prepare the IV: 12 bytes + an integer (counter) */ 93cf0bd0aeSCorentin LABBE memcpy(rctx->iv, req->iv, GCM_AES_IV_SIZE); 9436cf515bSGary R Hook for (i = 0; i < 3; i++) 95cf0bd0aeSCorentin LABBE rctx->iv[i + GCM_AES_IV_SIZE] = 0; 9636cf515bSGary R Hook rctx->iv[AES_BLOCK_SIZE - 1] = 1; 9736cf515bSGary R Hook 9836cf515bSGary R Hook /* Set up a scatterlist for the IV */ 9936cf515bSGary R Hook iv_sg = &rctx->iv_sg; 10036cf515bSGary R Hook iv_len = AES_BLOCK_SIZE; 10136cf515bSGary R Hook sg_init_one(iv_sg, rctx->iv, iv_len); 10236cf515bSGary R Hook 10336cf515bSGary R Hook /* The AAD + plaintext are concatenated in the src buffer */ 10436cf515bSGary R Hook memset(&rctx->cmd, 0, sizeof(rctx->cmd)); 10536cf515bSGary R Hook INIT_LIST_HEAD(&rctx->cmd.entry); 10636cf515bSGary R Hook rctx->cmd.engine = CCP_ENGINE_AES; 10736cf515bSGary R Hook rctx->cmd.u.aes.type = ctx->u.aes.type; 10836cf515bSGary R Hook rctx->cmd.u.aes.mode = ctx->u.aes.mode; 10936cf515bSGary R Hook rctx->cmd.u.aes.action = encrypt; 11036cf515bSGary R Hook rctx->cmd.u.aes.key = &ctx->u.aes.key_sg; 11136cf515bSGary R Hook rctx->cmd.u.aes.key_len = ctx->u.aes.key_len; 11236cf515bSGary R Hook rctx->cmd.u.aes.iv = iv_sg; 11336cf515bSGary R Hook rctx->cmd.u.aes.iv_len = iv_len; 11436cf515bSGary R Hook rctx->cmd.u.aes.src = req->src; 11536cf515bSGary R Hook rctx->cmd.u.aes.src_len = req->cryptlen; 11636cf515bSGary R Hook rctx->cmd.u.aes.aad_len = req->assoclen; 11736cf515bSGary R Hook 11836cf515bSGary R Hook /* The cipher text + the tag are in the dst buffer */ 11936cf515bSGary R Hook rctx->cmd.u.aes.dst = req->dst; 12036cf515bSGary R Hook 12136cf515bSGary R Hook ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd); 12236cf515bSGary R Hook 12336cf515bSGary R Hook return ret; 12436cf515bSGary R Hook } 12536cf515bSGary R Hook 12636cf515bSGary R Hook static int ccp_aes_gcm_encrypt(struct aead_request *req) 12736cf515bSGary R Hook { 12836cf515bSGary R Hook return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_ENCRYPT); 12936cf515bSGary R Hook } 13036cf515bSGary R Hook 13136cf515bSGary R Hook static int ccp_aes_gcm_decrypt(struct aead_request *req) 13236cf515bSGary R Hook { 13336cf515bSGary R Hook return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_DECRYPT); 13436cf515bSGary R Hook } 13536cf515bSGary R Hook 13636cf515bSGary R Hook static int ccp_aes_gcm_cra_init(struct crypto_aead *tfm) 13736cf515bSGary R Hook { 13836cf515bSGary R Hook struct ccp_ctx *ctx = crypto_aead_ctx(tfm); 13936cf515bSGary R Hook 14036cf515bSGary R Hook ctx->complete = ccp_aes_gcm_complete; 14136cf515bSGary R Hook ctx->u.aes.key_len = 0; 14236cf515bSGary R Hook 14336cf515bSGary R Hook crypto_aead_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx)); 14436cf515bSGary R Hook 14536cf515bSGary R Hook return 0; 14636cf515bSGary R Hook } 14736cf515bSGary R Hook 14836cf515bSGary R Hook static void ccp_aes_gcm_cra_exit(struct crypto_tfm *tfm) 14936cf515bSGary R Hook { 15036cf515bSGary R Hook } 15136cf515bSGary R Hook 15236cf515bSGary R Hook static struct aead_alg ccp_aes_gcm_defaults = { 15336cf515bSGary R Hook .setkey = ccp_aes_gcm_setkey, 15436cf515bSGary R Hook .setauthsize = ccp_aes_gcm_setauthsize, 15536cf515bSGary R Hook .encrypt = ccp_aes_gcm_encrypt, 15636cf515bSGary R Hook .decrypt = ccp_aes_gcm_decrypt, 15736cf515bSGary R Hook .init = ccp_aes_gcm_cra_init, 158cf0bd0aeSCorentin LABBE .ivsize = GCM_AES_IV_SIZE, 15936cf515bSGary R Hook .maxauthsize = AES_BLOCK_SIZE, 16036cf515bSGary R Hook .base = { 16136cf515bSGary R Hook .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | 16236cf515bSGary R Hook CRYPTO_ALG_ASYNC | 16336cf515bSGary R Hook CRYPTO_ALG_KERN_DRIVER_ONLY | 16436cf515bSGary R Hook CRYPTO_ALG_NEED_FALLBACK, 16536cf515bSGary R Hook .cra_blocksize = AES_BLOCK_SIZE, 16636cf515bSGary R Hook .cra_ctxsize = sizeof(struct ccp_ctx), 16736cf515bSGary R Hook .cra_priority = CCP_CRA_PRIORITY, 16836cf515bSGary R Hook .cra_type = &crypto_ablkcipher_type, 16936cf515bSGary R Hook .cra_exit = ccp_aes_gcm_cra_exit, 17036cf515bSGary R Hook .cra_module = THIS_MODULE, 17136cf515bSGary R Hook }, 17236cf515bSGary R Hook }; 17336cf515bSGary R Hook 17436cf515bSGary R Hook struct ccp_aes_aead_def { 17536cf515bSGary R Hook enum ccp_aes_mode mode; 17636cf515bSGary R Hook unsigned int version; 17736cf515bSGary R Hook const char *name; 17836cf515bSGary R Hook const char *driver_name; 17936cf515bSGary R Hook unsigned int blocksize; 18036cf515bSGary R Hook unsigned int ivsize; 18136cf515bSGary R Hook struct aead_alg *alg_defaults; 18236cf515bSGary R Hook }; 18336cf515bSGary R Hook 18436cf515bSGary R Hook static struct ccp_aes_aead_def aes_aead_algs[] = { 18536cf515bSGary R Hook { 18636cf515bSGary R Hook .mode = CCP_AES_MODE_GHASH, 18736cf515bSGary R Hook .version = CCP_VERSION(5, 0), 18836cf515bSGary R Hook .name = "gcm(aes)", 18936cf515bSGary R Hook .driver_name = "gcm-aes-ccp", 19036cf515bSGary R Hook .blocksize = 1, 19136cf515bSGary R Hook .ivsize = AES_BLOCK_SIZE, 19236cf515bSGary R Hook .alg_defaults = &ccp_aes_gcm_defaults, 19336cf515bSGary R Hook }, 19436cf515bSGary R Hook }; 19536cf515bSGary R Hook 19636cf515bSGary R Hook static int ccp_register_aes_aead(struct list_head *head, 19736cf515bSGary R Hook const struct ccp_aes_aead_def *def) 19836cf515bSGary R Hook { 19936cf515bSGary R Hook struct ccp_crypto_aead *ccp_aead; 20036cf515bSGary R Hook struct aead_alg *alg; 20136cf515bSGary R Hook int ret; 20236cf515bSGary R Hook 20336cf515bSGary R Hook ccp_aead = kzalloc(sizeof(*ccp_aead), GFP_KERNEL); 20436cf515bSGary R Hook if (!ccp_aead) 20536cf515bSGary R Hook return -ENOMEM; 20636cf515bSGary R Hook 20736cf515bSGary R Hook INIT_LIST_HEAD(&ccp_aead->entry); 20836cf515bSGary R Hook 20936cf515bSGary R Hook ccp_aead->mode = def->mode; 21036cf515bSGary R Hook 21136cf515bSGary R Hook /* Copy the defaults and override as necessary */ 21236cf515bSGary R Hook alg = &ccp_aead->alg; 21336cf515bSGary R Hook *alg = *def->alg_defaults; 21436cf515bSGary R Hook snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); 21536cf515bSGary R Hook snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", 21636cf515bSGary R Hook def->driver_name); 21736cf515bSGary R Hook alg->base.cra_blocksize = def->blocksize; 21836cf515bSGary R Hook alg->base.cra_ablkcipher.ivsize = def->ivsize; 21936cf515bSGary R Hook 22036cf515bSGary R Hook ret = crypto_register_aead(alg); 22136cf515bSGary R Hook if (ret) { 22236cf515bSGary R Hook pr_err("%s ablkcipher algorithm registration error (%d)\n", 22336cf515bSGary R Hook alg->base.cra_name, ret); 22436cf515bSGary R Hook kfree(ccp_aead); 22536cf515bSGary R Hook return ret; 22636cf515bSGary R Hook } 22736cf515bSGary R Hook 22836cf515bSGary R Hook list_add(&ccp_aead->entry, head); 22936cf515bSGary R Hook 23036cf515bSGary R Hook return 0; 23136cf515bSGary R Hook } 23236cf515bSGary R Hook 23336cf515bSGary R Hook int ccp_register_aes_aeads(struct list_head *head) 23436cf515bSGary R Hook { 23536cf515bSGary R Hook int i, ret; 23636cf515bSGary R Hook unsigned int ccpversion = ccp_version(); 23736cf515bSGary R Hook 23836cf515bSGary R Hook for (i = 0; i < ARRAY_SIZE(aes_aead_algs); i++) { 23936cf515bSGary R Hook if (aes_aead_algs[i].version > ccpversion) 24036cf515bSGary R Hook continue; 24136cf515bSGary R Hook ret = ccp_register_aes_aead(head, &aes_aead_algs[i]); 24236cf515bSGary R Hook if (ret) 24336cf515bSGary R Hook return ret; 24436cf515bSGary R Hook } 24536cf515bSGary R Hook 24636cf515bSGary R Hook return 0; 24736cf515bSGary R Hook } 248